Restoring Wireless Network Connection

Question: "How do I restore (or reconnect) to my laptop's wireless network connection without having to restart the computer?"

Details: I have a new Acer laptop with Windows Vista, and I have wireless Internet access when I first start my computer. However, after exactly 12 hours, the wireless network disconnects every time, and I need to restart my computer to regain Internet access again. Why does it disconnect automatically after 12 hours? It also disconnects whenever I put my computer on standby/sleep/hibernate and then turn it 'on' again. Either scenario, the only solution I know of right now to regain wireless network access is to restart my laptop. Any help so I don't need to restart my laptop all the time? (I tried the 'Diagnose' button to reset it, but that does not work.)

I also have a laptop with vista. Everything was working fine with the wireless card, but a few days ago in one specific webpage (www.terra.cl) the photo links can't be open anymore and I am prompted "Internet Explorer cannot display the webpage"

when I run the "diagnose connection problem" it suggests to "reset network adapter "wireless network connection""

When I do so thru the prompt popup window it seems that the computer is working on this (it says "reparing"), but finally it quits and states "there still seems to be a problem..."

I know the wireless card and connection is working 'cause I can surf other sites and I know the links can be open because I have open them from another computer